Generate content based on user selection

Hello guys, I’m looking into building a website like this: https://www.iubenda.com/

It basically works by generating content based on user selection. Before I go code frenzy I wanted to come here ask if something to achieve this already exists for wordpress (or any other framework/platform).

Basically the concept is this:

User login > generate content based on selections > generated content is server by javascript and can be embed into another website

Thank you in advance.